Find more classes in main branch that can be converted to record classes

[uschindler]

Description

This is an overview issue about all classes in current Lucene's main branch to be ported over to record classes. Record classes are fine for immutable data structures which have no functionality and are not part of class hierarchy (they have no superclass).

Records offer several simplifications for implementing them:

• equals, hashCode and toString are autogenerated by an invokedynamic, so we can't forget to handle it correctly
• it is also immutable
• all parameter checking logic can be moved to some special constructor without any parameters (this is new syntax since Java 17)
• In later java versions they will have an optimized internal layout and arrays of record classes may no longer be pointer arrays (see Project Valhalla with a first preview of it in Java 22). In future they will also not have identity anymore (I don't understand the impact yet).

The first PR #13205 already added support for record classes in our Javadoc linter (missing-doclet plugin).

The following classes are candidates (please add more here and add link to PR):

• IOContext, MergeInfo, FlushInfo: Convert IOContext, MergeInfo, and FlushInfo to record classes #13205
• BooleanClause Convert BooleanClause class to record class #13261
• FieldInfo ?
• All the variousFieldEntry classes used by codecs internally: Convert FieldEntry to record #13296
• All the various FieldMetaData/FSTMetadata/DirectMonotonicReader.Meta classes used by codecs internally.
• More classes: Convert more classes to record classes #13328